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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_MESSAGE_CENTER_MESSAGE_CENTER_OBSERVER_H_
#define UI_MESSAGE_CENTER_MESSAGE_CENTER_OBSERVER_H_
#include <optional>
#include <string>
#include "base/observer_list_types.h"
#include "ui/message_center/message_center_export.h"
#include "ui/message_center/message_center_types.h"
namespace message_center {
class NotificationBlocker;
// An observer class for the change of notifications in the MessageCenter.
// WARNING: It is not safe to modify the message center from within these
// callbacks.
class MESSAGE_CENTER_EXPORT MessageCenterObserver
: public base::CheckedObserver {
public:
// Called when the notification associated with |notification_id| is added
// to the notification_list.
virtual void OnNotificationAdded(const std::string& notification_id) {}
// Called when the notification associated with |notification_id| is removed
// from the notification_list.
virtual void OnNotificationRemoved(const std::string& notification_id,
bool by_user) {}
// Called when the contents of the notification associated with
// |notification_id| is updated.
virtual void OnNotificationUpdated(const std::string& notification_id) {}
// Called when a click event happens on the notification associated with
// |notification_id|. |button_index| will be nullopt if the click occurred on
// the body of the notification. |reply| will be filled in only if there was
// an input field associated with the button.
virtual void OnNotificationClicked(
const std::string& notification_id,
const std::optional<int>& button_index,
const std::optional<std::u16string>& reply) {}
// Called when notification settings button is clicked. The |handled| argument
// indicates whether the notification delegate already handled the operation.
virtual void OnNotificationSettingsClicked(bool handled) {}
// Called when the notification associated with |notification_id| is actually
// displayed.
virtual void OnNotificationDisplayed(
const std::string& notification_id,
const DisplaySource source) {}
// Called when the message view associated with `notification_id` is hovered.
virtual void OnMessageViewHovered(const std::string& notification_id) {}
// Called when the notification center is shown or hidden.
virtual void OnCenterVisibilityChanged(Visibility visibility) {}
// Called whenever the quiet mode changes as a result of user action or when
// quiet mode expires.
virtual void OnQuietModeChanged(bool in_quiet_mode) {}
// Called when the blocking state of |blocker| is changed.
virtual void OnBlockingStateChanged(NotificationBlocker* blocker) {}
// Called after a visible notification popup closes, indicating it has been
// shown to the user, and whether the notification is marked as read.
virtual void OnNotificationPopupShown(const std::string& notification_id,
bool mark_notification_as_read) {}
};
} // namespace message_center
#endif // UI_MESSAGE_CENTER_MESSAGE_CENTER_OBSERVER_H_
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